Massif (noun)

A large compact and often isolated mountain mass, typically having steep sides and a more or less flat top.

Origin:

Mid 19th century: from french, from masser 'to mass'.

Examples:

1. The Alps are a massive massif stretching across several countries.
2. The climbers were attempting to reach the summit of the massif.
3. The massif is surrounded by a range of smaller peaks.
4. The massif was formed millions of years ago through tectonic activity.
5. The massif is home to many unique species of plants and animals, found nowhere else in the world.